Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
  • F23D11/36—Details, e.g. burner cooling means, noise reduction means
  • F23D11/40—Mixing tubes or chambers; Burner heads
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D9/00—Burners in which a stream of liquid fuel impinges intermittently on a hot surface
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
  • F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
  • F23D11/36—Details, e.g. burner cooling means, noise reduction means
  • F23D11/40—Mixing tubes or chambers; Burner heads
  • F23D11/406—Flame stabilising means, e.g. flame holders
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
  • F23D11/36—Details, e.g. burner cooling means, noise reduction means
  • F23D11/40—Mixing tubes or chambers; Burner heads
  • F23D11/408—Flow influencing devices in the air tube
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
  • F23D2900/11401—Flame intercepting baffles forming part of burner head

Definitions

• the invention relates to a burner for a heater, in particular for use in motor vehicles, with a substantially axially symmetric combustion chamber, a Bren ⁇ nerdüse for supplying and atomizing fuel, the ei ⁇ ne fuel needle for supplying fuel into the combustion chamber and a combustion air supply for feeding combustion air into the combustion chamber, a start zone in which an ignition of the fuel to the start of the burner er ⁇ follows, a heat shield between the burner nozzle and the combustion chamber, wherein the heat shield has openings for supplying secondary air into the combustion chamber, and one in the Combustion chamber arranged baffle plate.
• Such burners which are also referred to as atomizing burners or as spray burners, are used in particular in auxiliary heaters and auxiliary heaters for motor vehicles.
• the requirement to allow different installation positions of the heating appliance is related to the problems relating to the starting behavior.
• the object of the invention is to at least partially overcome the described problems of the prior art and, in particular, to enable a reliable and low-emission or low-smoke starting behavior with different mounting positions.
• the invention is based on the burner of the generic type in that, by selecting the inner diameter of the fuel needle, the exit velocity of the fuel is predetermined in such a way that fuel reaches the starting zone in a substantially unatomized form during a starting phase of the burner Beerleitelemen- th are equipped, and that the baffle plate vor ⁇ a given curvature in the axial direction.
• the inner diameter of the fuel needle compared to fuel needles in heaters of the prior art is increased at the same fuel delivery volume, the exit velocity of the fuel. This makes it possible in any installation position that a fuel jet from the outlet opening of the fuel needle in the Start zone arrives.
• the inner diameter of the fuel needle is between 0.5 and 0.7 mm.
• the exit velocity at inner diameters between 0.5 and 0.7 mm can be almost doubled or even more than doubled ,
• the inner diameter of the fuel needle is about 0.6 mm.
• the exit velocity in the range of 0.35 m / s.
• the exit speed increases during part-load operation, that is to say at a fuel mass flow of 0.2 kg / h from approximately 0.14 m / s to approximately 0.25 m / s.
• the starting zone is designed as a starting chamber into which an ignition element protrudes.
• the wall of the combustion chamber can in this way the
• Combustion chamber wall and adjacent components serve as a wall evaporator after their warming.
• the air guiding elements are formed by tabs formed in the direction of the combustion chamber and integrally formed with the heat shield.
• a heat shield can be manufactured in a simple manner, for example by forming holes with a V-shaped punching tool, which are bent out of the plane of the heat shield after or with the punching operation.
• the invention is also usefully further developed in that the tabs are arranged at different angles to the surface of the heat shield and / or to the radius of the heat shield. Shield are formed. If the tabs extend almost perpendicular to the radius of the heat shield, a strong twist is introduced by the latter, while a lesser twist is introduced by tabs with a smaller angle to the radius. Tabs, which occupy a small angle to the surface of the heat shield, produce Heilströ ⁇ regulations, which have a large radial component and a small axial component, while in tabs with large angles to the surface of the heat shield, the axial component dominated. In this way, it is possible to direct secondary air with little twist into the core region of flame formation.
• the air required for combustion is supplied; however, there is no excessive swirl which would adversely affect the stabilization of the flame.
• a division of the secondary air can take place as a function of the orientation of the individual air guiding elements.
• the tabs are formed in groups at substantially identical angles to the surface of the heat shield and / or to the radius of the heat shield. The collective alignment of the straps results in defined flow states in the combustion chamber.
• the invention is further useful in that the burner has a burnout zone and that the secondary air supplied to the burnout zone has a higher swirl than the secondary air supplied to the start zone.
• the burner has a burnout zone and that the secondary air supplied to the burnout zone has a higher swirl than the secondary air supplied to the start zone.
• a high twist is desired.
• a radially inward swirled back Stream area improves burnout and ensures that the combustion chamber volume is well utilized.
• the curvature is provided in the direction of the burnout zone. As a result, a sufficient space is provided in the region of the starting chamber. Furthermore, it has been found that the curvature in the direction of the burn-out zone does not adversely affect the flow behavior in this zone. In particular, the turbulent pronounced backflow region is retained in the radially inner region of the burnout zone.
• the outer circumference of the baffle plate defines a level and that the ratio between the maximum axial distance of the baffle plate from this plane and the diameter of the baffle plate is between 0.07 and 0.21.
• the most bulged point of the baffle plate is preferably substantially at the center of the assembly with respect to the radial coordinate. From the plane defined by the outer circumference of the baffle plate, this point has an axial distance defined by the specified ratio to the diameter.
• the ratio between the maximum axial distance of the baffle plate from the plane and the diameter of the baffle plate is about 0.14.
• the round diameter of the baffle plate is about 40 mm, while the buckle has a value of about 5.7 mm.
• the invention is based on the finding that the operating behavior of a burner can be markedly improved by the novel fuel feed with a fuel needle having a reduced outlet cross section, the novel heat shield with air guiding elements and the novel curved baffle plate. This applies in particular to the starting behavior, the stability of the burner operation and the possibilities with regard to the installation position of the burner in the motor vehicle.
• FIG. 1 shows a sectional view of a burner according to the invention
• FIG. 2 is a perspective view of a burner flange with a heat shield inserted therein;
• FIG 3 shows a perspective view of a heat shield.
• FIG. 1 shows a sectional view of a device according to the invention
• the burner 10 has a nozzle 12 which is fixedly connected to a heat shield 24.
• the combustion chamber tube 40 is surrounded by an outer tube 42, which forms the burner flange.
• a flame tube 38 is attached.
• the connections between heat shield 24 and combustion chamber tube 40 or between combustion chamber tube 40, outer tube 42 and flame tube 38 are generally welded joints.
• a fuel feed 50 is arranged, which has a metal tube 52 for supplying fuel and a fuel needle 14 for injecting fuel into the combustion chamber 22.
• a baffle plate 36 is further arranged, which has an advantageous curvature. This curvature in the direction of the burn-out zone 32 is advantageous because heat-induced spontaneous changes in form of the baffle plate 36 are thereby prevented. Due to the curvature of the baffle plate 36 in the direction of the Ausbrandzone 32 is also a sufficient space for the accommodation of the start chamber 18 is available. The wall defining the start chamber 18 is welded to the baffle plate 36.
• FIG. 2 shows a perspective view of a burner flange with heat shield inserted therein
• FIG. 3 shows a perspective view of a heat shield.
• the heat shield 24 has a central opening 48 through which the fuel-air mixture discharged from the nozzle 12 enters the combustion chamber. Furthermore, a laterally arranged opening 34 for the passage of the ignition element 20 is provided. On the heat shield 24 fastening pins 44, 46 are further provided, on which the nozzle 12 is attached.
• the heat shield 24 also has a plurality of openings 26 through which secondary air can enter the combustion chamber 22. On the combustion chamber 22 facing side of the Hit ⁇ zeschildes 24 triangular air guide elements 28, 30 are provided.
• a first group of air guiding elements whose members are partially designated by the reference numeral 28, are aligned at a large angle to the radius of the heat shield 24, that is to say their orientation is substantially or almost tangential.
• the secondary air which passes through the corresponding openings 26 and whose outlet flow direction is indicated by an arrow, passes with high swirl past the baffle plate 36 into the burn-out zone 32.
• This air which is provided with high swirl, flows radially outer region of the Ausbrandzone 32 in the rear region of the combustion chamber 22, that is in the heat shield 24 facing away from the combustion chamber 22, and then with great turbulence in the central region back towards the baffle plate 36.
• Another group of air-guiding elements 30 has a smaller angle to the radius of the heat shield 24 in their orientation. These air guide elements are partially identified by the reference numeral 30. Moreover, these air guiding elements 30 have a smaller angle to the surface of the heat shield 24 than the air guiding elements 28. Consequently, secondary air whose outlet flow direction is indicated by a further arrow is guided by these air guiding elements 30 with slight swirl into the core region of the flame , which in particular favors a stable burning behavior.
• a novel spray burner is provided which is improved with regard to the possible installation positions, the starting behavior and the behavior in continuous operation. Furthermore, problems with regard to temperature-induced changes in shape of the baffle plate are avoided.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Spray-Type Burners (AREA)
• Air-Conditioning For Vehicles (AREA)
• Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=35994656

Family Applications (1)

Country Status (9)

Families Citing this family (5)

Family Cites Families (10)

• 2005
  • 2005-11-16 US US11/719,572 patent/US20090220901A1/en not_active Abandoned
  • 2005-11-16 EP EP05806922A patent/EP1812748A1/de not_active Withdrawn
  • 2005-11-16 KR KR1020077013152A patent/KR20070086040A/ko not_active Application Discontinuation
  • 2005-11-16 WO PCT/DE2005/002061 patent/WO2006053542A1/de active Application Filing
  • 2005-11-16 CA CA002594577A patent/CA2594577A1/en not_active Abandoned
  • 2005-11-16 JP JP2007541671A patent/JP2008520950A/ja not_active Withdrawn
  • 2005-11-16 DE DE112005003411T patent/DE112005003411A5/de not_active Withdrawn
  • 2005-11-16 CN CNA2005800433261A patent/CN101080595A/zh active Pending
  • 2005-11-16 RU RU2007122503/06A patent/RU2007122503A/ru not_active Application Discontinuation

Non-Patent Citations (1)

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